Originally Posted by rpenmanparker

Well it doesn't allow for crazy big largest and second largest cogs, which are where the danger lies. But that really isn't an issue on small arm derailleurs. If you are pushing beyond the recommended limit, however, and that is an issue for you, perhaps one of the other methods would work better. But if you confine yourself to the recommended maximum cog for a short derailleur, which is usually 28 teeth, I don't see how it could fail you.